Yes, you must declare an ECU remap to your insurance provider. It is classified as a modification, and failing to disclose it can invalidate your entire policy — not just engine-related claims, but everything including theft and third-party cover. That said, the actual impact on your premium is usually far less scary than people think.
Why You Must Declare It
Insurance policies require you to disclose any modifications to your vehicle. An ECU remap changes the engine's performance characteristics, so it counts. This is not optional or a grey area — it is a straightforward legal requirement.
If you have an accident and your insurer discovers an undeclared remap, they can void your policy from inception. That means you are treated as if you were never insured at all. The financial consequences of that are far worse than any premium increase.
What Actually Happens to Your Premium
This is where the reality is much better than the fear. For a standard Stage 1 remap on a common vehicle:
- Many mainstream insurers will cover it with little or no premium increase
- Specialist modification insurers like Adrian Flux or Performance Direct often offer competitive rates for remapped vehicles
- Typical increases range from 0% to about 15% for a straightforward Stage 1 map
- Higher stages with physical modifications will naturally cost more to insure
The key is to shop around. Some standard insurers will add a disproportionate amount for any modification, while specialists understand the difference between a sensible Stage 1 and a fully built track car.
How to Declare It
When you contact your insurer, tell them you have had an ECU remap and provide the approximate power increase. You do not need to go into technical detail about boost pressures and injection timing — just the basics. "Stage 1 ECU remap, approximately 30bhp increase" is sufficient.
If your current insurer is not interested, do not panic. Get quotes from modification-friendly insurers. You will almost certainly find reasonable cover.
What About Economy Remaps?
Even if you have had a pure economy remap with no power increase, you should still declare it. The software has been modified, and that is what matters from an insurance perspective. The good news is that an economy-only remap is unlikely to affect your premium at all, since you are not increasing the vehicle's performance.
The Smart Approach
Get your insurance sorted before or immediately after the remap. Call your insurer, declare the modification, and get confirmation in writing. If they increase your premium unreasonably, shop around — there are plenty of insurers who understand remapping and price it fairly.
Not declaring is never worth the risk. A few pounds extra per month is nothing compared to having your entire policy voided when you need it most. Any trustworthy remapper will remind you to sort your insurance — if they do not mention it at all, that tells you something about how they operate.
For professional remappers who take the time to advise you properly on insurance and other practical matters, RemappingWebsite.com is a good place to find one near you.